WO2006059577A1 - Appareil de fabrication de verre et procédé de fabrication de verre - Google Patents

Appareil de fabrication de verre et procédé de fabrication de verre Download PDF

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Publication number
WO2006059577A1
WO2006059577A1 PCT/JP2005/021815 JP2005021815W WO2006059577A1 WO 2006059577 A1 WO2006059577 A1 WO 2006059577A1 JP 2005021815 W JP2005021815 W JP 2005021815W WO 2006059577 A1 WO2006059577 A1 WO 2006059577A1
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WO
WIPO (PCT)
Prior art keywords
glass
liquid
vacuum
clarification
pump
Prior art date
Application number
PCT/JP2005/021815
Other languages
English (en)
Japanese (ja)
Inventor
Kazuhiro Yamamoto
Akihiro Koyama
Junji Kurachi
Hiromitsu Seto
Daisuke Miyabe
Yutaka Senshu
Original Assignee
Nippon Sheet Glass Company, Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Sheet Glass Company, Limited filed Critical Nippon Sheet Glass Company, Limited
Publication of WO2006059577A1 publication Critical patent/WO2006059577A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/225—Refining
    • C03B5/2252—Refining under reduced pressure, e.g. with vacuum refiners

Definitions

  • the present invention relates to a glass manufacturing apparatus and a glass manufacturing method using a vacuum clarification method for reducing bubbles contained in molten glass in a reduced pressure atmosphere.
  • glass is formed by melting a glass raw material into a molten glass (melting process), and reducing the compositional deviation in the molten glass as necessary (homogenization process) (molding process).
  • melting process melting process
  • homogenization process melting process
  • molding process reducing the compositional deviation in the molten glass as necessary
  • molten glass there are innumerable bubbles formed by chemical decomposition of raw materials.
  • bubbles may affect the optical properties of the product after molding.
  • glass or the like used for a display substrate is required to be substantially free of bubbles that affect the properties of the substrate. For this reason, the process of reducing bubbles in glass melt (clarification process) is very important in the glass manufacturing process.
  • a vacuum clarification method is known as one of the clarification methods!
  • molten glass is introduced from the molten portion into the vacuum clarified portion held in a reduced pressure atmosphere by a pressure reducing device to reduce bubbles contained in the molten glass.
  • An example of a glass manufacturing apparatus using a vacuum clarification method is disclosed in, for example, Japanese Patent Laid-Open No. 5-208830.
  • the vacuum clarification tank constituting the vacuum clarification section is held in a reduced pressure atmosphere by a vacuum pump. Examples of specific decompression means including a vacuum pump are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 2000-095526 and 2000-095527.
  • the gas sucked from the vacuum clarification section contains a gas containing reduced bubbles (forces that vary depending on the type of glass, such as water vapor, CO, N, SO, chloride,
  • the glass production apparatus of the present invention includes a melting part that melts a glass raw material to form a molten glass, and a vacuum clarification part (vacuum degassing part) that reduces bubbles contained in the molten glass in a reduced pressure atmosphere.
  • a glass production apparatus comprising: a molding unit that molds the molten glass in which the bubbles are reduced in the vacuum clarification unit; and a vacuum pump connected to the vacuum clarification unit, wherein the pressure reduction pump includes: It is a liquid ring pump.
  • the glass production method of the present invention includes a melting step of melting a glass raw material to form a molten glass, transferring the molten glass to a vacuum clarification portion in a reduced pressure atmosphere, and melting the glass at the vacuum clarification portion.
  • a method for producing a glass comprising: a vacuum clarification step (vacuum defoaming step) for reducing bubbles contained in the glass; and a molding step for forming the molten glass with reduced bubbles. Then, the atmosphere in the vacuum clarification part is depressurized by a liquid ring pump connected to the vacuum clarification part.
  • FIG. 1 is a schematic view showing an example of a glass manufacturing apparatus of the present invention.
  • FIG. 2 is a cross-sectional view schematically showing an example of a liquid ring pump used in the glass manufacturing apparatus of the present invention.
  • FIG. 3 is a schematic view showing another example of the glass manufacturing apparatus of the present invention.
  • FIG. 4 is a schematic view showing still another example of the glass manufacturing apparatus of the present invention.
  • FIG. 5 is a schematic view showing still another example of the glass manufacturing apparatus of the present invention.
  • FIG. 6 is a schematic view showing another example of the glass manufacturing apparatus of the present invention different from the above.
  • FIG. 7 is a schematic view showing another example of the glass manufacturing apparatus of the present invention different from the above.
  • FIG. 8 is a schematic view showing an example different from the above of the glass manufacturing apparatus of the present invention.
  • FIG. 9 is a schematic view showing an example different from the above of the glass manufacturing apparatus of the present invention.
  • FIG. 10 is a schematic view showing another example of the glass manufacturing apparatus of the present invention different from the above.
  • FIG. 11 is a schematic view showing an example different from the above of the glass manufacturing apparatus of the present invention.
  • FIG. 12 is a schematic diagram showing a melting experimental apparatus used in a confirmation experiment.
  • the glass manufacturing apparatus shown in FIG. 1 includes a melting part (melting tank 2) that melts a glass raw material to form a molten glass 4, and a vacuum clarification part that reduces bubbles contained in the molten glass 4 in a reduced-pressure atmosphere. (Reduced pressure clarification tank 3 and chamber 36), reduced pressure clarification tank (vacuum defoaming tank) 3, molding part 5 for forming molten glass 4 in which bubbles are reduced, and atmosphere in reduced pressure clarification tank 3 A liquid ring pump 6 for reducing the pressure is provided.
  • the liquid ring pump 6 is a pump that exhausts using the liquid seal 33 supplied to the pump, and is connected to the chamber 36 via a pipe 7.
  • the vacuum clarification tank 3 is accommodated in the chamber 36, and the atmosphere in the vacuum clarification tank 3 is decompressed together with the atmosphere in the chamber 36.
  • the gas 8 sucked into the liquid ring pump 6 from the vacuum clarification tank 3 through the suction port 34 is discharged together with the sealing liquid 33 from the discharge port 35.
  • FIG. 2 shows an example of the liquid ring pump 6.
  • an impeller (impeller) 32 is disposed in a cylindrical case 31 at a position eccentric with respect to the center of the case 31.
  • the sealing liquid 33 comes into contact with the inner wall of the case 31 to form a ring shape.
  • the gas 8 sucked from the suction port 34 is combined with the sealing liquid 33.
  • 35 outlets Are discharged.
  • the liquid seal 33 plays a part of the function of sucking and discharging the gas 8.
  • the gas 8 sucked from the vacuum clarification tank 3 contains various contaminants. However, if the atmosphere in the vacuum clarification tank 3 is reduced by the liquid ring pump 6, the above contamination will occur. When the sealing liquid 33 in the liquid ring pump 6 takes in the substance, the contaminated substance can be discharged out of the pump together with the sealing liquid. Further, even when the gas 8 sucked into the liquid ring pump 6 is at a high temperature, the sucked gas can be quickly cooled by the sealing liquid 33.
  • the liquid-sealed pump 6 is not easily damaged by the gas 8 sucked from the vacuum clarification tank 3, for example, a condenser or a chemical spraying device, which has been conventionally arranged, between the vacuum clarification section and the vacuum pump, Dust collectors can be omitted.
  • the distance between the pump for decompressing the atmosphere in the vacuum clarification tank and the vacuum clarification section can be shortened, so that clogging of the piping can be suppressed. That is, in the glass manufacturing apparatus of the present invention, vacuum clarification can be stably performed while simplifying the facilities as compared with the conventional glass manufacturing apparatus.
  • the present invention can be applied regardless of the type of glass to be produced.
  • the effect is large when the glass to be produced contains a highly volatile component (for example, diboron trioxide (B 2 O 3)).
  • B 2 O 3 diboron trioxide
  • the sealing liquid 33 supplied to the liquid sealing pump 6 is not particularly limited as long as the liquid sealing pump 6 functions, and may be, for example, a sealing liquid 33 containing water.
  • sealing liquid 33 containing water contaminants contained in the gas 8 sucked from the depressurized clarification tank 3 can be efficiently taken in, and the sealing liquid after being discharged from the liquid ring pump 6 is processed. Is also relatively easy. Specifically, of the contaminants, water vapor condenses and CO
  • sealing liquid 33 2, SO, chloride, fluoride, etc. are dissolved and Z or precipitated in the sealing liquid 33, and the volatilized glass component is cooled and dissolved and Z or precipitated in the sealing liquid 33 and discharged from the liquid sealing pump 6. Is done.
  • water has a relatively large specific heat, so that the sucked gas 8 can be efficiently cooled.
  • the sealing liquid 33 containing water is easier to supply to the liquid sealing pump 6 than a non-aqueous solvent.
  • the contaminated substance taken into the sealing liquid 33 has various forms depending on the type of sealing liquid, the kind of the substance taken into the sealing liquid at the same time, the temperature and pH of the sealing liquid, and the like.
  • B O which is a glass component volatilized in the vacuum clarification tank 3 is water.
  • the glass component volatilized in the vacuum clarification tank 3 When the glass component volatilized in the vacuum clarification tank 3 is taken into the sealing liquid 33 as shown in 3 3, it takes the form of various compounds such as chlorides, sulfates and hydroxides of the elements constituting the glass component. sell. These compounds, including boric acid, can be said to be components derived from molten glass.
  • the solution containing water is not particularly limited, and may be, for example, an aqueous solution in which various solutes are dissolved or water.
  • the water includes pure water such as ion exchange water and distilled water in addition to general industrial water and clean water. For example, if a basic aqueous solution is used for sealing liquid 33, CO
  • the basic aqueous solution may be, for example, a hydroxide-alkali aqueous solution, a hydroxide-alkali earth aqueous solution, an alkali carbonate aqueous solution, an alkali carbonate alkaline earth aqueous solution, or the like.
  • the liquid ring pump 6 is not particularly limited, and a general liquid ring pump (when water is supplied as the seal liquid 33, it may be referred to as a "water ring pump") may be used.
  • the connection between the liquid ring pump 6 and the reduced pressure clarification section is not particularly limited as long as the atmosphere in the reduced pressure clarification tank 3 can be reduced.
  • One 36 The clarification tank 3 is accommodated, and the chamber 36 and the liquid ring pump 6 may be connected via the pipe 7.
  • FIG. 3 shows another example of the glass manufacturing apparatus of the present invention.
  • the glass manufacturing apparatus 1 shown in FIG. 3 further includes a pressure control mechanism 11 that adjusts the pressure in the vacuum clarification tank 3 between the vacuum clarification unit and the liquid ring pump 6.
  • the reduced pressure clarification unit and the pressure control mechanism 11, and the pressure control mechanism 11 and the liquid ring pump 6 are connected by pipes 7a and 7b.
  • the pressure in the vacuum clarification tank 3 can be controlled more delicately.
  • the structure and configuration of the pressure control mechanism 11 are not particularly limited, and may include, for example, a pressure adjustment valve or a leak valve.
  • the pressure control mechanism 11 and the liquid ring pump 6 may be connected via a control system and controlled in conjunction with each other.
  • the position where the pressure control mechanism 11 is disposed is not particularly limited.
  • the pressure control mechanism 11 may be connected to the vacuum clarification unit independently of the pipe 7 leading to the liquid ring pump 6, or may be connected to the vacuum clarification unit and the liquid ring pump 6. You may arrange
  • FIG. 4 shows another example of the glass manufacturing apparatus of the present invention.
  • the glass manufacturing apparatus 1 shown in FIG. 4 further includes a temperature control mechanism 12 that controls the temperature of the sealing liquid 33 supplied to the liquid sealing pump 6.
  • the ultimate degree of vacuum of the liquid ring pump 6 can be controlled by the vapor pressure of the sealing liquid 33, that is, the temperature of the sealing liquid 33 because of the structure of the pump. For this reason, the temperature of the sealing liquid 33 supplied to the liquid sealing pump 6 can be controlled by the temperature control mechanism 12, and the pressure in the vacuum clarification tank 3 can be controlled.
  • the pressure supplied to the liquid-sealed pump 6 is controlled by the temperature control mechanism 12 in order to set the pressure in the vacuum clarification tank 3 to a range of 0.05 atmospheric pressure to 0.5 atmospheric pressure, for example.
  • the temperature of liquid 33 should be in the range of about 10 ° C to 70 ° C.
  • the sealing liquid 33 discharged from the liquid ring pump 6 is circulated using the circulation mechanism and re-supplied to the liquid ring pump 6, the liquid sealing pump 6 is supplied to the flow path of the sealing liquid 33 in the circulation mechanism.
  • the pressure fluctuation in the vacuum clarification tank 3 can be reduced (FIGS. 7 and 8).
  • the component derived from the molten glass taken into the sealing liquid 33 may be used.
  • the sealing liquid 33 in which at least a part can be deposited and the content of the component is reduced can be re-supplied to the liquid sealing pump 6, vacuum clarification can be performed more stably. You can.
  • the deposited molten glass-derived components may be recovered as described later and reused as a glass raw material.
  • the structure and configuration of the temperature control mechanism 12 are not particularly limited, and may be any temperature control mechanism 12 including a heat exchanger, a heater, a cooler, and the like.
  • the position at which the temperature control mechanism 12 is disposed is not particularly limited as long as it is disposed in the flow path for supplying the sealing liquid 33.
  • the distance between the temperature control mechanism 12 and the liquid ring pump 6 is short.
  • a thermometer may be placed near the liquid ring pump 6 in the flow path to measure the temperature of the liquid seal 33 and fed back to the temperature control mechanism 12 for control! Two or more temperature control mechanisms 12 may be arranged.
  • FIG. 5 shows still another example of the glass manufacturing apparatus of the present invention.
  • the glass manufacturing apparatus 1 shown in FIG. 5 further includes an adjustment tank 13 for adjusting the pH of the sealing liquid 33 discharged from the liquid sealing pump 6.
  • the discharged sealing liquid 33 includes, for example, CO, SO, chloride, fluoride, B 2 O, Na 0, Li 0, as contaminants contained in the gas 8 sucked from the vacuum clarification tank 3.
  • the structure and configuration of the adjustment tank 13 are not particularly limited, and may be, for example, the adjustment tank 13 in which a pH adjusting agent such as a neutralizing agent is housed, or the pH adjusting agent may be contained in the tank. It may be the adjustment tank 13 including the adjustment agent supply device to be supplied.
  • the position where the adjustment tank 13 is disposed is not particularly limited, and may be disposed in the flow path through which the sealing liquid 33 is discharged from the liquid sealing pump 6.
  • the number of liquid ring pumps 6 (vacuum clarification tank 3) connected to one adjustment tank 13 is not particularly limited. In other words, the number of adjusting tanks 13 for one liquid ring pump 6 (for one vacuum clarification tank 3) is not particularly limited.
  • two or more vacuum clarification tanks 3, two or more liquid ring pumps 6 connected to two or more vacuum clarification tanks 3, and the liquid ring pump force It may be a glass manufacturing apparatus 1 provided with the adjustment tank 13 that collectively adjusts the pH of the liquid 33.
  • Such a manufacturing apparatus 1 can be reduced in size compared with the conventional glass manufacturing apparatus.
  • two or more adjustment tanks 13 may be arranged for one liquid ring pump 6 (for one vacuum clarification tank 3). In this case, if two or more adjustment tanks 13 are alternately used in any combination, the maintenance of the adjustment tank 13 can be performed while performing clarification under reduced pressure.
  • the glass manufacturing apparatus of the present invention has a recovery mechanism for recovering at least a part of the components derived from the molten glass 4 taken into the sealing liquid 33 discharged from the liquid sealing pump 6. 1 7 may further be provided.
  • the sealing liquid 33 discharged from the liquid ring pump 6 contains a component derived from the molten glass 4, that is, a component derived from the glass component volatilized in the vacuum clarification tank 3. The higher the volatility of the glass component, the greater the amount that can be produced.
  • the collection mechanism 17 the collected component can be reused as a glass raw material, and when the sealing liquid 33 is re-supplied to the liquid-sealed pump 6, re-supply becomes easy.
  • the glass manufacturing apparatus includes the liquid ring pump 6 and the recovery mechanism 17, it is possible to reuse a material that has been collected and discarded in a dust collector or the like. The amount of waste can be reduced.
  • boric acid can be recovered as a component derived from niobium triacid by using, for example, water having a pH of around 7 as the sealing liquid 33.
  • the structure and configuration of the recovery mechanism 17 are not particularly limited.
  • the recovery mechanism 17 controls a temperature control mechanism that controls the temperature of the sealing liquid 33, an adjustment tank that adjusts the pH of the sealing liquid 33, and Z or What is necessary is just to provide the coagulation tank which coagulates at least one part of the component derived from the molten glass taken in into the sealing liquid 33.
  • the temperature control mechanism provided in the recovery mechanism 17 may appropriately control the temperature of the sealing liquid 33 discharged from the liquid ring pump 6 as long as it has the same structure and configuration as the temperature control mechanism 12 described above. Thus, the component derived from the molten glass taken in the sealing liquid 33 can be precipitated.
  • the adjustment tank provided in the recovery mechanism 17 has the same structure and configuration as the adjustment tank 13 described above, and by appropriately adjusting the pH of the sealing liquid 33 discharged from the liquid ring pump 6, The component derived from the molten glass taken in the sealing liquid 33 can be deposited.
  • the aggregating agent may be an adjusting tank in which the aggregating agent is accommodated! It may be a coagulation tank containing
  • the position where the flocculation tank is disposed is not particularly limited as long as it is disposed in the flow path from which the liquid seal pump 6 is discharged.
  • the aggregating tank or the adjusting tank 13 may be provided with a temperature control mechanism, in which the aggregating tank and the adjusting tank 13 may be integrated.
  • the specific means for recovering the components derived from precipitation and Z or agglomerated molten glass is not particularly limited, and includes a temperature control mechanism including a precipitate (aggregate) recovery mechanism, an adjustment tank, and Z or agglomeration tank. There may be a trap or the like for collecting precipitates (aggregates) in the flow path of the sealing liquid 33.
  • the recovery mechanism 17 may include a distillation mechanism for heating and distilling the sealing liquid 33.
  • the distillation mechanism the components derived from the molten glass 4 contained in the sealing liquid 33 can be deposited and recovered more easily than in the temperature control mechanism and adjustment tank, and the structure and distillation conditions of the distillation mechanism should be set appropriately. Thus, most of the above components contained in the sealing liquid 33 can be collected.
  • the distillation mechanism includes a condenser, the sealing liquid evaporated by distillation can be liquefied and re-supplied to the liquid sealing pump 6.
  • the sealing liquid 33 contains boric acid as a component derived from molten glass, it may be distilled by heating while maintaining the pH of the sealing liquid 33 at around 7.
  • the glass manufacturing apparatus further includes a heat transfer mechanism that transmits heat of at least one selected from a melting part and a vacuum clarification part to the distillation mechanism. Since the sealing liquid 33 can be distilled using the residual heat of the melting part and Z or the clarification part under reduced pressure, the energy efficiency of the glass manufacturing apparatus can be improved. heat
  • the structure and configuration of the transmission mechanism are not particularly limited.
  • the glass manufacturing apparatus of the present invention may further include a circulation mechanism 14 that re-feeds the sealing liquid 33 discharged from the liquid ring pump 6 to the liquid ring pump 6 as shown in FIG. Good.
  • the total amount of sealing liquid 33 required for continuous vacuum clarification can be reduced.
  • the circulation mechanism 14 separates the sealing liquid 33 discharged from the liquid ring pump 6 from the gas 8 and the gas-liquid separation mechanism 15 and the sealing liquid 33 into the liquid ring pump 6. It includes a refeeding liquid pump 16, a temperature control mechanism 12 for controlling the temperature of the sealing liquid 33 supplied to the liquid sealing pump 6, and a pressure control mechanism 11 for adjusting the pressure in the vacuum clarification tank 3. .
  • the gas-liquid separation mechanism 15, the liquid feeding pump 16, the temperature control mechanism 12 and the pressure control mechanism 11 may be arranged as necessary.
  • the arrangement position and the number of arrangement in the circulation mechanism 14 are not particularly limited, and two or more temperature control mechanisms 12 may be arranged.
  • a heat exchanger or a cooler is arranged so as to cool the sealing liquid 33 discharged from the liquid ring pump 6, and then the cooling liquid is cooled.
  • the circulation mechanism 14 When the circulation mechanism 14 is provided, it is not always necessary to resupply the liquid seal pump 6 with the entire amount of the seal liquid 33 discharged from the liquid seal pump 6.
  • the ratio of the sealing liquid 33 resupplied by the circulation mechanism 14 can be arbitrarily set. That is, all of the discharged sealing liquid 33 may be supplied again, or only a part of it may be supplied again. When only a part is resupplied, the circulating liquid and the newly supplied sealing liquid may be mixed and supplied to the liquid ring pump 6.
  • the circulation mechanism 14 may include a flow rate control mechanism.
  • the circulation mechanism 14 may include an optional device as necessary.For example, a trap for removing the solid matter contained in the discharged sealing liquid 33 or a temporary sealing liquid 33 is used. Including a storage tank to store.
  • the adjustment tank 13 is preferably disposed in the flow path of the sealing liquid 33 in the circulation mechanism 14.
  • the position and number of adjustment tanks 13 in the circulation mechanism 14 are not particularly limited.
  • the circulation mechanism 14 is arranged in parallel with the flow path of the sealing liquid 33 in the circulation mechanism 14.
  • Two or more adjustment tanks 13a and 13b may be provided.
  • the flow path of the sealing liquid 33 in the circulation mechanism 14 is alternately switched between the adjustment tank 13 a and the adjustment tank 13 b, thereby performing clarification under reduced pressure while performing the refining of the adjustment tank 13. Maintenance (for example, collection and removal of deposits accumulated in the adjustment tank 13) can be performed.
  • FIG. 10 shows another example of the glass manufacturing apparatus of the present invention.
  • the circulation mechanism 14 includes a recovery mechanism 17 disposed in the flow path of the sealing liquid 33 in the circulation mechanism 14.
  • the recovered components can be reused as glass raw materials, and the amount of waste can be further reduced by re-supplying the sealing liquid 33 to the liquid sealing pump 6.
  • FIG. 11 shows another example of the glass manufacturing apparatus of the present invention.
  • two or more liquid ring pumps 6a and 6b are connected to the vacuum clarification section.
  • the apparatus related to the liquid ring pump 6 and the liquid ring pump 6 (the pressure control mechanism 11 described above). Maintenance of the temperature control mechanism 12, the adjustment tank 13, the circulation mechanism 14, the recovery mechanism 17, the agglomeration tank, etc.) can be performed while performing vacuum clarification.
  • the structure, configuration and the like of the melting tank 2 are not particularly limited as long as the glass raw material can be melted by heating, and may be the same structure and structure as those of a melting tank generally used as a glass manufacturing apparatus.
  • the structure, configuration, and the like of the vacuum clarification section are not particularly limited as long as the inside of the vacuum clarification tank 3 can be maintained in a reduced pressure atmosphere, and have the same structure and configuration as the vacuum clarification section generally used as a glass manufacturing apparatus. I just need it.
  • the pressure in the reduced pressure clarification tank 3 at the time of reduced pressure clarification is not particularly limited as long as reduced pressure clarification can be carried out, and for example, it may be maintained in the range of about 0.05 atm to 0.5 atm.
  • a melting tank 2 is shown as a melting part
  • a vacuum clarification tank 3 and a chamber 36 are shown as a vacuum clarification part.
  • a glass raw material is used. As long as the glass can be melted by heating, and as long as the bubbles contained in the molten glass can be reduced in a reduced-pressure atmosphere, the molten part and the reduced-pressure clarified part have an arbitrary structure and configuration, respectively. be able to.
  • the molten glass 4 is introduced almost horizontally from the melting tank 2 to the vacuum clarification tank 3, but between the melting tank 2 and the vacuum clarification tank 3. A difference in elevation may be provided, and the molten glass 4 may be introduced into the upper or lower force of the vacuum clarification tank 3.
  • the structure, configuration, and the like of the molding unit 5 are not particularly limited, and may be the same structure and configuration as a molding unit generally used as a glass manufacturing apparatus.
  • a homogenization part that reduces the deviation of the composition of the molten glass after reducing bubbles.
  • an adjustment tank that temporarily stores the molten glass, a stirring unit that generates bubbles by stirring the molten glass before vacuum clarification may be provided.
  • the glass manufacturing method of the present invention can be carried out, for example, using the above-described glass manufacturing apparatus of the present invention.
  • a reduced-pressure atmosphere in the reduced-pressure clarification step is realized using a liquid ring pump.
  • the liquid-sealed pump can omit the condenser, the chemical spraying device, the dust collector, etc., which are conventionally required to be hardly damaged by the gas sucked from the vacuum clarification unit. For this reason, according to the present invention, it is possible to stably perform clarification under reduced pressure while using equipment that is simpler than before.
  • the pressure-reducing clarification can be performed while suppressing the fluctuation of the reduced-pressure atmosphere in the reduced-pressure clarification process (for example, the pressure fluctuation in the reduced-pressure clarification tank). It can be carried out.
  • the fluctuation of the reduced-pressure atmosphere becomes a factor that hinders the reduction of bubbles contained in the molten glass in the reduced-pressure clarification process. For this reason, according to the present invention, continuous production of glass with sufficiently reduced bubbles (ie, stable quality) is facilitated.
  • the sealing liquid supplied to the liquid ring pump is not particularly limited as long as the liquid ring pump functions, and for example, a sealing liquid containing water may be supplied.
  • a sealing liquid containing water When supplying a sealing liquid containing water, it is possible to efficiently take in contaminants contained in the gas sucked in the vacuum clarification process, and it is relatively easy to process the sealing liquid after it is discharged. is there.
  • water has a relatively large specific heat, so that the sucked gas can be efficiently cooled.
  • sealing liquid containing water is easier to supply to the liquid ring pump than non-aqueous solvents.
  • a basic aqueous solution may be supplied to the liquid ring pump. In this case, CO, SO,
  • the solution containing water and the basic aqueous solution are not particularly limited, and may be the same as the solution described above in the description of the glass manufacturing apparatus of the present invention.
  • the reduced-pressure atmosphere in the reduced-pressure clarification step may be, for example, in the range of about 0.05 atm to 0.5 atm.
  • the melting step and the forming step are not particularly limited, and a method and an apparatus generally used for glass production may be used. Specifically, it can be applied to various glass production methods such as a float method, a roll-out method, a Colburn method, and a fusion method.
  • the pressure in the vacuum clarification unit may be controlled by controlling the temperature of the sealing liquid supplied to the liquid ring pump in the vacuum clarification step.
  • the ultimate vacuum of the liquid seal pump is limited by the vapor pressure of the seal liquid to be supplied due to the structure of the pump. For this reason, excessive depressurization in the vacuum refining section can be suppressed, and continuous production of glass with sufficiently reduced bubbles (ie, stable quality) becomes easier.
  • the method for controlling the temperature of the sealing liquid is not particularly limited.
  • the temperature control mechanism 12 in the glass manufacturing apparatus of the present invention may be used.
  • the sealing liquid is water
  • the sealing liquid having a temperature in the range of about 10 ° C to 70 ° C.
  • a pressure control mechanism is arranged between the vacuum clarification unit and the liquid ring pump, and in the vacuum clarification step, the pressure in the vacuum clarification unit is adjusted using the pressure control mechanism. You may control. In addition, it is preferable to control the pressure in the vacuum clarification section by combining the control of the temperature of the sealing liquid supplied to the liquid ring pump and the control by the pressure control mechanism. And excessive decompression can be further suppressed.
  • the pressure control mechanism may be the same as the pressure control mechanism 11 in the glass manufacturing apparatus of the present invention.
  • the method for combining the control of the sealing liquid temperature and the control by the pressure control mechanism is not particularly limited. For example, the pressure control mechanism and the temperature control mechanism arranged in the sealing liquid supply line are connected via the control system. Connect and control in conjunction.
  • the sealed liquid pump in the reduced-pressure clarification process, is also discharged.
  • the pH of the liquid may be adjusted. Molten glass force Contaminating substances contained in the sucked gas can be neutralized, and sealing liquid processing and resupply can be performed more easily.
  • at least a part of the molten glass-derived component taken into the sealing liquid can be deposited in the sealing liquid.
  • the precipitated glass component may be recovered and reused, for example.
  • the method for adjusting the pH of the discharged sealing liquid is not particularly limited.
  • the adjustment tank 13 in the glass manufacturing apparatus of the present invention may be used.
  • a pH adjusting agent such as a neutralizing agent may be brought into contact with the sealing liquid transferred to the adjusting tank (adding a pH adjusting agent). At that time, the pH of the sealing liquid in the adjustment tank may be measured, and the measurement result of the pH may be fed back to the contact amount (addition amount) of the pH adjusting agent to the sealing liquid.
  • the sealing liquid that also discharges the liquid ring pump force may be re-supplied to the liquid ring pump. It is possible to reduce the total amount of sealing liquid required to perform the vacuum clarification process continuously.
  • the method for re-supplying the sealing liquid is not particularly limited.
  • the circulation mechanism 14 in the glass manufacturing apparatus of the present invention may be used.
  • the temperature of the sealed liquid from which the liquid-sealed pump force is also discharged may be controlled.
  • at least a part of the components derived from the molten glass taken into the sealing liquid can be deposited in the sealing liquid.
  • the precipitated glass component may be recovered and reused, for example.
  • the reduced-pressure clarification step in the reduced-pressure clarification step, at least a part of the molten glass-derived component taken into the sealed liquid discharged from the liquid-sealed pump force as the substance sucked from the reduced-pressure clarification part is recovered. May be.
  • the recovered components can be reused as glass raw materials, and the recovered components can be reused as glass raw materials, or the sealing liquid after recovering the above components can be re-supplied to a liquid ring pump. By doing so, the amount of waste during glass manufacturing can be reduced.
  • the recovery mechanism 17 in the glass manufacturing apparatus of the present invention may be used.
  • At least one method selected from control of the pH, adjustment of the pH of the sealing liquid, aggregation of components derived from the molten glass incorporated in the sealing liquid, and distillation of the sealing liquid may be used.
  • the raw material mixture was added to the raw material mixture at an external number relative to the composition of the raw material mixture so that it would be 0.24% and 0.10% in terms of raw material.
  • all the content rate in said each component is the mass%.
  • a melting experimental apparatus 51 shown in FIG. 12 was prepared, and the produced raw material mixture was accommodated in a crucible 53 disposed in an electric furnace 52.
  • the crucible 53 is disposed in a concave portion of the crucible base 54, and the space in which the crucible 53 is disposed can be sealed by the lid 55. Further, a suction pipe 56 passes through the lid 55, and the gas in the space can be sucked outside the electric furnace 52.
  • the temperature of the crucible 53 was raised to 1500 ° C to roughly melt the mixture, and the temperature of the crucible 53 was further raised to 1600 ° C.
  • the pump 59 and the exhaust pipe 58 connected to the pump 59 started suction of the gas in the space.
  • the pressure in the space at the time of suction was about 0.9 atm.
  • the suction pipe 56 and the exhaust pipe 58 are connected via a bottle 62 containing pure water 61, and the end of the suction pipe 56 is located below the surface of the pure water 61.
  • the gas sucked from the space passes through the pure water 61 and is then discharged out of the device 51 through the exhaust pipe 58 and the pump 59. That is, in the apparatus 51, the gas sucked from the space is passed through the pure water 61 in the bottle 62, so that the gas generated by the liquid ring pump when the pure water is supplied as the sealing liquid at the time of reduced pressure clarification. It was assumed that suction could be confirmed easily.
  • B (boron), Si (caine), and Ca (calcium) were analyzed by plasma emission analysis, C1 (chlorine) was analyzed by spectrophotometry, and F (fluorine) was analyzed by ion meter. Results of analysis As a result, B (boron) 5.7 ppm, CI (chlorine) 0.6 ppm, F (fluorine) 0.28 ppm, Si (caine) 0.4 ppm, and Ca (calcium) 0.04 ppm were detected. Further, when the collected solution was dried and solidified, boric acid could be collected in the solid material obtained by solidification.
  • a liquid ring pump as a pump for depressurizing the vacuum clarification part
  • the glass manufacturing apparatus and glass manufacturing method of the present invention can be applied regardless of the type of glass.
  • application to glass containing a highly volatile component for example, diboron trioxide is effective.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Melting And Manufacturing (AREA)

Abstract

L’invention concerne un appareil de fabrication de verre permettant de réaliser de manière stable une clarification sous vide ; et un procédé de fabrication de verre idoine. Elle porte sur un appareil de fabrication de verre comprenant une unité de fusion capable de faire fondre un matériau brut de verre pour obtenir un verre fondu ; une unité de clarification sous vide capable de réduire les bulles d’air emprisonnées dans le verre fondu dans une atmosphère sous vide ; une unité de moulage capable de faire fondre le verre fondu avec des bulles d’air réduites par l’unité de clarification sous vide ; et une pompe à vide connectée à l’unité de clarification sous vide, où la pompe à vide est une pompe étanche au liquide.
PCT/JP2005/021815 2004-12-01 2005-11-28 Appareil de fabrication de verre et procédé de fabrication de verre WO2006059577A1 (fr)

Applications Claiming Priority (2)

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JP2004-348384 2004-12-01
JP2004348384 2004-12-01

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WO2006059577A1 true WO2006059577A1 (fr) 2006-06-08

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016117628A (ja) * 2014-12-24 2016-06-30 日本電気硝子株式会社 ガラス繊維の製造方法
CN106830626A (zh) * 2017-04-06 2017-06-13 蚌埠玻璃工业设计研究院 一种电子显示用玻璃熔窑的减压气泡排出系统
JP2017226551A (ja) * 2016-06-20 2017-12-28 日本電気硝子株式会社 ガラス原料溶融装置及び溶融ガラスの製造方法
JP2018149496A (ja) * 2017-03-13 2018-09-27 Ｊｆｅスチール株式会社 減圧型余剰安水蒸留設備の操業方法及び封液温度制御装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5519989A (en) * 1978-07-24 1980-02-13 Siemens Ag Liquid ring pump
JPS59213989A (ja) * 1983-05-20 1984-12-03 Mitsubishi Electric Corp 閉サイクル排気装置
JPH08505679A (ja) * 1993-01-25 1996-06-18 シーメンス アクチエンゲゼルシヤフト 液体リング式機械
JPH09142851A (ja) * 1995-11-21 1997-06-03 Asahi Glass Co Ltd ガラス製品の製造方法及び装置
JPH11130443A (ja) * 1997-10-27 1999-05-18 Asahi Glass Co Ltd 並列式減圧脱泡装置
JP2004238236A (ja) * 2003-02-05 2004-08-26 Nippon Electric Glass Co Ltd ガラス溶融方法およびガラス溶融設備

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5519989A (en) * 1978-07-24 1980-02-13 Siemens Ag Liquid ring pump
JPS59213989A (ja) * 1983-05-20 1984-12-03 Mitsubishi Electric Corp 閉サイクル排気装置
JPH08505679A (ja) * 1993-01-25 1996-06-18 シーメンス アクチエンゲゼルシヤフト 液体リング式機械
JPH09142851A (ja) * 1995-11-21 1997-06-03 Asahi Glass Co Ltd ガラス製品の製造方法及び装置
JPH11130443A (ja) * 1997-10-27 1999-05-18 Asahi Glass Co Ltd 並列式減圧脱泡装置
JP2004238236A (ja) * 2003-02-05 2004-08-26 Nippon Electric Glass Co Ltd ガラス溶融方法およびガラス溶融設備

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016117628A (ja) * 2014-12-24 2016-06-30 日本電気硝子株式会社 ガラス繊維の製造方法
JP2017226551A (ja) * 2016-06-20 2017-12-28 日本電気硝子株式会社 ガラス原料溶融装置及び溶融ガラスの製造方法
WO2017221617A1 (fr) * 2016-06-20 2017-12-28 日本電気硝子株式会社 Appareil de fusion de matériau de départ de verre et procédé de production de verre fondu
JP2018149496A (ja) * 2017-03-13 2018-09-27 Ｊｆｅスチール株式会社 減圧型余剰安水蒸留設備の操業方法及び封液温度制御装置
CN106830626A (zh) * 2017-04-06 2017-06-13 蚌埠玻璃工业设计研究院 一种电子显示用玻璃熔窑的减压气泡排出系统

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